<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<frameset rows='400,*'>
	<frameset cols='500,*'>
		<frame src="1.html" name="a"/>
		<frame src="2.html"  name="b"/>
	</frameset>
	<frameset cols='500,*'>
		<frame src="3.html"  name="c"/>
		<frame src="4.html"  name="d"/>
	</frameset>
</frameset>
</html>